#include <fcntl.h>
#include "apue.h"

int main(int argc, char *argv[])
{
	int val;
	if(argc < 2)
		err_quit("usage: a.out <descriptor#>");
	if(val = fcntl(atoi(argv[1]), F_GETFL, 0) < 0)
		err_sys("fcntl error for fd %d", atoi(argv[1]));

	switch(val & O_ACCMOD)
	{
		case O_RDONLY:
			printf("read only");
			break;
		case O_WRONLY:
			printf("write only");
			break;
		case RDWR:
			printf("read write");
			break;
		default:
			err_dump("unknown access mode");
	}

	if(val & O_APPEND)
		printf(", append");
	if(val & O_NONBLOCK)
		printf(", nonblocking");

#if defined(O_SYNC)
	if(val & O_SYNC)
		printf(", synchronous writes");
#endif
#if !defined(_POSIX_C_SOURCE) && defined(O_FSYNC)
	if(val & O_FSYNC)
		printf(", synchronous writes");
#endif

	printf("\n");

	return 0;
}
